S
M
T
W
T
F
S
26
81°
61°
27
81°
60°
28
81°
58°
29
82°
63°
30
83°
64°
31
86°
63°
1
84°
57°
2
81°
57°
3
81°
59°
4
80°
57°
5
80°
56°
6
81°
56°
7
81°
57°
8
80°
58°
9
80°
62°
10
81°
63°
11
80°
63°
12
80°
61°
13
83°
63°
14
85°
57°
15
84°
56°
16
80°
60°
17
82°
58°
18
83°
56°
19
79°
55°
20
78°
54°
21
79°
60°
22
79°
56°
23
78°
61°
24
78°
61°
25
79°
60°
26
83°
62°
27
83°
62°
28
82°
61°
29
84°
61°
30
83°
54°
31
77°
54°
1
77°
53°
2
76°
54°
3
77°
59°
4
75°
53°
5
80°
53°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Sun Valley
Sun Valley's August 2026 forecast shows daily high temperatures ranging from 75° to 86°, with overnight lows between 53° and 64°. The average high for August is 81° with an average low of 59°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how August weather will actually feel in Sun Valley. See also: September | October | November.
